GE Charcoal Filter for Universal Ventilation Models - UXCF91This GE charcoal filter is a replacement for those used in their recirculating venting systems. Whether for a recirculating function on a range hood or custom kit installed separately, this package provides high quality air filtration before it is redistributed into your kitchen space. It is recommended that charcoal filters be replaced every six months or if they are noticeably dirty or discoloured.